• A
    Kill pests
  • B
    Prevent pest growth
  • C
    Retain soil fertility
  • D
    All of the above


Biofertilizers are used because they increase soil fertility, crop productivity, and production. Use of biofertilizers is both economical as well as environment-friendly. They remain symbiotically associated with the roots while some are free living. They solubilize the undissolved minerals.
So, the correct answer is option C.